Piston valve



March 9, 1954 J. D PALMER 2,671,632

PISTON VALVE Filed March 24, 1949 2 Sheets-Sheet l i im-: -f n, l' N ,l n J.: I 1

\- INVENTOR.

J. D. PALMER 2,671,632

PISTON VALVE 2 Sheets-Sheet 2 March 9, 1954 Filed March 24. 1949 Psfenad Mu. s, 1954 PISTON VALVE Joseph D. Palmer, Tulare, Calif.; Catherine Palmer Wolford, administratrix of Joseph D. Palmer, deceased Application March 24, 1949, Serial No. 83,219

1 Claim.

This invention relates -to a valve, and more particularly to a valve for controlling the ilow of iluid to a compressor.

The object of the invention is to provide a valve which is adapted to be interposed in a conduit conveying iluid whereby the valve will. control the flow of iluid from the conduit to a compressor in response to the pressure of fluid in the line or conduit.

Another object of the invention is to provide a pressure actuated valve which will stop the ilow of iluid to a compressor when the pressure in the line leading to the compressor drops below a predetermined degree.

A further object of the invention is to provide a valve which is extremely simple and inexpensive to manufacture.

Other objects and advantages will be apparent during the course of the following description.

In the accompanying drawings, forming a part of this application, and in which like numerals are used to designate like parts throughout the same:

Figure 1 is a side elevational view of the valve, with parts thereof broken away and in section, according tothe present invention, the valve beins open:

Figure 2 is a view similar to Figure l. showing .he position of the parts of the valve when the valve is in equilibrium; e

Figure 3 is a central sectional view of the valve, showing the pomtion oi the parts when the valve is closed:

Figure 4 is a top plan view of the valve:

Figure 5 is a sectional view taken on the line I-l of Figure 3:

Figure 6 is a bottom plan view of the sealing ring and yoke:

Figure 7 is a sectional view taken on the line l-1 o! Figure 4;

Figure 8 is a fragmentary view showing certain constructionai details of the valve; and

Figure 9 is a sectional view taken on the line 3-3 of Figure 2.

Referring in detail in the drawings, the numeral 23 designates a housing which may be fabricated' of any suitable material. Arranged at right angles with respect to an end of the housing 2l is a hollow casing 2i which may be formed integral with or secured to the housing 2l as desired. Arranged in spaced concentric relation within the casing 2l is a cylinder 22, the cylinder 22 being supported in the casing 2i by means of suitable supporting members 23, Figure 5. The members 23 ooact with the cylinder 22 and casing 2 2| to deilne a pair of semi-cylindrical chambers 24 and 23. A rst conduit 28 is arranged in threaded engagement with the casing 2| Figures 1 and 3, and a suitable bushing 21 is threaded. onto the conduit 26. A second conduit 23 is ar- -ranged in threaded engagement with the casing 2|, and the conduit 23 communicates with the upper chamber 24 for a purpose later to be described, there being a suitable bushing 21 threaded onto the conduit or line 28.

The wall of the cylinder 22 is provided with ports 23, 30, 3l and 32, and these ports are arranged in spaced relation with respect to each other. A suitable aperture 33 is also arranged in the wall of the cylinder 22 for equalizing the pressure in the end of the cylinder. Slidably arranged in the cylinder 22 is a piston 34 which is provided with a transverse annular cutout or groove 35 which is adapted to selectively open and close the ports 23 through 32 for controlling the now of fluid therethrough. Projecting from the front end of the piston 34 and secured thereto is an ear 36, and a link 31 has one of its ends pivotally connected to the projecting end of the ear 36 by means `of a pin 33. 'I'he other end of the link 31 is pivotally connected to an arm 33 by means of a pin 4o. 'Ihe arm 33 includes -a flat portion 4l which is adapted to contact the interior surface of the casing 2| when the valve is in closed position.

Supported on the other end of the housing 23 is an annular rim 42, there being a gasket 43 arranged between the rim 42 and a yoke 44. 'I'he yoke 44 is arranged adjacent to the rim 42, and suitable headed bolts 43, Figures 4 and 7, project through the apertured ilange 43 which is formed integral with the yoke 44. The bolts 45 also project through the rim 42 and into the housing 2l for maintaining the parts in assembled relation.

Formed integral with, or secured to the web 41 of the yoke 44 is a bushing 43. An elongated rod 43 is slidably supported in a web 60 which is secured to the inner surface of the housing 20. The rod 43 has a portion of its interior surface threaded exteriorly as at 5I there being a sleeve 52 threaded on the rod 43, and the sleeve 52 slidably rides in the bushing 43. A tension nut 33 is threaded onto the projecting end of the rod 43 and a suitable coil spring 34 is circumposed on the rod 43 and the coil spring 34 is interposed between the nut I3 and the web 41 of the yoke 44.

A second tension nut Il is also threaded on the rod 43, and a suitable coil spring I3 is inter- I the open end of the housing 29 when the prese.

sure in the housing exceeds a predetermined degree. A pair of toggle switches 69 are carried by the yoke 44, and each toggle switch comprises a threaded sleeve 6| which has slidably supported therein a plunger 62. An exteriorly knurled cap 69 is arranged in threaded engagement with the sleeve 6| and a suitable coil spring 64 is positioned or interposed between the cap 63 and the plunger 62 for normally urging the plunger 62 away from the cap 63. A collar 65 is mounted on the rod 49 intermediate its ends, and a pin or rivet 66 secures the collar 55 to the rod 49. A pair of links 61 each have one end connected to the complemental plunger 62 by a ball and socket joint 68 while the other end of each of the links 61 is pivotally connected to the collar 65 by a ball and socket joint 69.

The inner or lower end of the rod 49 is provided with a slot 19, Figure 8. A pin 1l is carried by the inner end of the rod 49 and slidably positioned in the slot 10 is a lever 12 which is provided with a slot 19 through which projects the pin 1|. 'I'he lever 12 projects into a slot 14 in the arm 99 and a pin 15 pivotally connects the lever 12 to the arm 99. A stop member 16 is secured to the housing 29 and the stop member 16 is adapted to be contacted by a portion of the arm 39 for limiting upward movement of the rod 49.

In use, the valve may be inserted in a refrigeration system wherein the conduit 26 will convey suitable gaseous fluid from a cooling coil and the fluid will enter the compartment 25. When the .pressure of this liluid is suillciently high, the bellows 51 will be contracted. There are several forces acting in various ways on the rods 39. Thus, the pressure of the bellows 51 and the pressure exerted by the coil spring 54 normally tend to urge the rod 49 upward or out of the housing 29, while the coil spring 59 normally urges the rod 49 downwardly or into the housingi 2li. The toggle switches 69 serve to increase the effectiveness of the coil springs 54 and 59, depending on which position the rod 49 is in. Therefore, assuming that the pressure is sumcient to overcome the pressure exerted by th`e spring 56, then the rod 49 will be in the position shown in Figure 1 and when the rod is in such position, the piston 34 is arranged so that gas can pass through the port 29 and out through port 92 and into compartment 24. Also, gas can pass through ports 99 through the annular groove 35 in the piston 94, and out through port 9| into compartment 24. The gas then leaves compartment 24 and is conveyed or passes to a compressor (not shown) The compressor will of course operate to pump this iluid through the Compressor.

4 line 28 until the pressure has fallen below a predetermined degree. Then when the pressure falls suiliciently. the force exerted by the spring 56 will overcome the total pressure exerted byl the spring 54, toggle switches. 99, and bellows 51 to move the rods 49 downwardly to the position shown in Figure 3. 'This movement of the rod 49 causes the piston 34 to move in the cylinder 22 to thereby close the ports 29 through 92 so that no gas can pass therethrough and into the Thus, the valve will remain closed until the pressure again builds up sumciently to cause the valve to automatically open.

The nuts 53 and 55 and the caps 99 can be readily adjusted so that the tension of the respective coil springs can be varied as desired. Further, the valve could be'used as a suction throttling valve wherein. gas could Ibe conveyed into the valve through line 29, and the gas leaving the valve will pass through line 29. In using the valve as a suction throttling valve, the link 91 is lengthened so that the valve closes and opens when the pressure varies beyond a predetermined range.

While I have shown and described a preferred embodiment of my invention, this is by way ot illustration only and I consider as my own all such modiilcations in construction as fairly fall within the scope of the appended claim.

I claim:

In a valve, a casing, a cylinder arranged in said casing in spaced concentric relation to said casing, a pair of supporting members supporting said cylinder within said casing, said members coasting with said cylinder and said casing to dene inlet and outlet chambers, a plurality of .ports arranged inl said cylinder, a ilrst conduit arranged in threaded engagement with an end of said casing i'or the ingress therethrough ot fluid and the axis of the first conduit lying in a separate plane from the axes of the cylinder and casing but parallel thereto, a second conduit arranged in threaded engagement with the same end of said casing for the egress therethrough of fluid, and the axis of the second conduit being in a separate plane from the axis of the first conduit but parallel thereto, and a piston slidably arranged in said cylinder and adapted to selectively open and close the ports oi' said cylinder for controlling the iiow of iiuid through said ports.

. JOSEPH D. PALMER.

References Cited in the ille of this patent UNITED STATES PATENTS Number Name Date 1,735,511 Shrode Nov. 12, v1929 1,740,135 Wishart Dec. 1'1, 1929 1,800,243 Birks Apr. 14, 1931 1,847,073 Ernst Mar. 1, 1932 1,922,928 Cave Aug. 15, 1933 1,927,609 Markert Sept. 19, 1933 1,953,433 Replogle Apr. 3, 1934 2,010,500 Smith Aug. 6, 1935 2,209,418 Overbeke July 30, 1940 2,226,611 McCollum Dec. 31, 1940 2,327,366 Nampa Aug. 24, 1943 2,525,487 Johnson Oct. 10, 1950 

